Free port scanner 2.0 software for windows

Port Scanner is a free and very fast port scanner. So at least I think from what I have seen from around the web. A couple of ports have been hard coded to detect what it is but there are others that have not been coded in so it will come up as ???

How wide open is your door?
Scan your computer for open/listening ports used by hackers.

Not the best port scanner around but it works well and quite fast. It is useful for security audit of your personal computer.
Faltron Port Scanner scans for TCP listening/open ports on your or remote system. You can scan a range of ports or just a single port. You SHOULD NOT scan others system without their permission! I will not held responsible if you use it for illegal purposes.
The speed will be a bit slower when scanning remote system. You can double click on an open port to view more information on the DShield website.

A port scanner is a must have tool for the network administrator. It allows you to scan your network for active ports. This way you can identify applications such as web servers, ftp servers etc. running on your servers and workstations. Any unused applications should be stopped. Furthermore, you can scan your network for ports that might be used by Trojans.The LANguard port Scanner can be used to: - Scan newly installed systems for active services that are not needed or not configured properly. - Scan for newly added ports that might indicate Trojan activity - Check proxy firewall ports - Test router access lists - Perform basic security checks - Look for reverse telnet ports - Verify available network servicesThe LANguard port scanner is freeware.

HighSpeed Port Scanner is a free tool intended for fast search of open ports. Search can be carried out both in a local network, and on the Internet.
Speed of scanning reaches more than 2500 ports per second!
This program doesn?t use the multi-thread algorithm therefore it is not required the big resources in an operating time.
The HighSpeed Port Scanner has three modes of speed of scanning: low, medium and high. Use of each of these modes depends on speed of connection.

Faltron Java Port Scanner is a open source and very simple port scanner written in Java.
It maximize the use of multi-threading by creating as much threads as possible, thus speeding up the scanning process.
I have not add any special features in the first release. Feel free to modify it, you can find the source codes here. If you are not a programmer, you can still download and use it using the link above.
To run, double click on the jar file, but you need to have the Java Runtime Environment installed. It is compiled with Java JDK 6.